This exercise helps you learn to breathe more deeply, lower in your lungs. Start out doing one round for 3 to 4 minutes a day. Then add more round until you are doing two or three rounds a day.
Sit comfortably in a straight-back chair or lie down on a relatively flat surface. Place your right hand over your belly button and your left hand on your chest, over your sternum. Allow yourself to exhale just a bit longer than usual. Inhale fully. Imagine filling your belly up with air like a balloon, allowing your diaphragm to contract or move downward. Your right hand, on your belly, should move out. Your left hand, on your chest, should move as little as possible. After a brief natural pause, exhale again, extending your exhale a bit longer than usual.